This term, Kingdom of the Lord is referred to twice in Scripture and is speaking about the Kingdom of Israel during and after the reign of King David.
1 Chronicles 28:5 And of all my sons, (for the LORD hath given me many sons,) he hath chosen Solomon my son to sit upon the throne of the kingdom of the LORD over Israel.
2 Chronicles 13:8 And now ye think to withstand the kingdom of the LORD in the hand of the sons of David; and ye be a great multitude, and there are with your golden calves, which Jeroboam made you for gods.⇛ checkout List of Topics